Double-spring friction draft-rigging.



No. 761,795. I PATENTED JUNE 7, 1904..

M P. B. TOWNSEND.

DOUBLE SPRING FRIOTIONDRAPT RIGGING.

APPLIOATION FILED r113. 24. 1904.

no menu. 2 snms-sn11nr 1.

III/YYNESSES: ENTOR.

aid 41 a.

, I 4% ATTORNEY5 No. 761,795. PATENTED JUNE 7,1904.

F. B. TOWNSEND.

DOUBLE SPRING FRICTION ,DRAFTRIGGING.

APPLICATION FILED FEB. 24. 1904.

ZSHEBTS-SHEET 2.

no MODEL.

INVENTO/G. v fi/ W.

WITNESSES.-

UNITED STATES Patented June '7, 1904.

PATENT OFFICE.

FREDERICK B. TOWNSEND, OF CHICAGO, ILLINOIS, ASSIGNOR TO W. H. MINERCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DOUBLE-SPRING FRICTION DRAFT-.RIGGING.

SPECIFICATION forming part of Letters Patent No. 761,795, dat d une '7,1904. Application filed February 24., 1904. Serial No. 195,040.(NoinodeL) To all whom, it may concern.-

- BeitknownthatI,FEEDEEIoKB.TowNsEND, a citizen of the United States,residingin Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Double-Spring FrictionDraft-Rigging, of which the following is a specification.

My invention relates to friction spring draft-rigging for railway-cars.

The object of my invention is to provide a friction draft-rigging of astrong, simple, efficient, and durable construction, composed of fewparts and having a very powerful directacting spring resistance inconnection witha frictional resistance without undulyincreasing thelength of the draft-rigging as a whole resultthat is to say, itconsists, in connection" with a draw-bar and draw-bar yoke or extensionsecured thereto, apair ofside plates or stopcastings secured to thecenter sills or framework of the car, and a pair of followers fittingbetween the upper and lower limbs of the draw-bar extension or yoke, ofa longitudinally-sliding laterally-oblong friction-shell havinga closedrear end abutting against the rear follower and adapted to bealternately moved with the draw-bar by one'follower and held stationaryby the other follower, two parallel longitudinally arranged springsfiting side by side within said laterally-oblong friction-shell, a pairof oppositely-disposed laterally-oblong wedges, one bearing against thefront follower and the other against thetwo parallel springs, a pair ofwide laterally-oblong longitudinally-sliding friction-blocks havingexterior friction-faces bearing against the upper and lower wideinterior friction-faces of said friction-shell, and a pair oflongitudinally-sliding narrow friction-blocks having upright exteriorfriction-faces in sliding frictional engagement with the narrow uprightinterior friction-faces of said longitudinally-sliding friction-shell.The laterally-oblong longitudinally-sliding friction-shell, by reason ofits laterally-extended fiat bearing against the follower at its rear endand the cooperative action of the friction-blocks, wedges, and followerat its opposite end, operates to equalize any difference of tension andresistance in the two parallel springs, and thus to prevent any impropertilting of the draw-bar or diagonal or twisting strain on thedraft-rigging.

My invention also consists in'the novel con: struction of parts anddevices and in the novel combinations of parts and devices herein shownor described.

In the accompanying drawings, which form a part of this specification,Figure 1 is a central vertical longitudinal section of a frictiondraft-rigging embodying my invention. Fig. 2 is a plan view, partly inhorizontal section, on line 2 2 of Fig. 1. Fig. 3 is across-section online 3-3 of Fig. 2. Fig. i is a detail perspective View of one of thetwo wide longitudinally-sliding frictionblocks. Fig. 5 is a crosssectionon line 5 5 of Fig. 2. Fig. 6 is a detail elevation, and Fig. 7 is adetail front view, of' one of the wedges.

' In the drawings, A A represent center sills or longitudinal framepieces of the car, A the cross-sill, and A the carry-iron.

B is the coupler, B the draw-bar, and B the draw-bar extension or yokerigidly secured to the draw-bar by the bolts or rivets Z) andinter-engaging shoulders Z) 6 C C are the followers, and D D are theside plates or stop-castings, each having a front stop d and a rear stop(Z to engage the followers and hold the same alternately stationary. A Aby bolts or rivets d The sills A are represented as being of an ordinarysteel carfrarne construction. The side plates or stopeastings D haveeach an integralupper guide or flange d for the followers and also alower removable guide (Z secured thereto by bolts (Z having threadednuts (Z E E are apair of parallel longitudinally-ar- The side plates aresecured to the sills ranged springs, the same preferably having smallsprings 0 inside the same.

F is a longitudinally-sliding laterally-oblong friction shell or casehaving a closed rear end f abutting directly against the rear follower Cand fitting between the upper and lower limbs or members of the draw-barextension or yoke B The sliding friction-shell F has anexternally-projecting rim f", furnished with a notch or recess f toreceive the upper limb or member of the draw-bar yoke B and thus causethe yoke itself to center or guide the friction-shell or hold the yokeand shell centrally in relation to each other. he parallel side-by-sidesprings E c and E e fit inside the laterally-oblong friction-shell andat their rear ends bear directly against the closed end f of the shell.The laterally-oblong friction-shell F has at its front end or portiontwo wide horizontal interior frictionfacesf and two narrow uprightfriction-faces f", all of the friction-faces being in planes parallel tothe line of draft. The friction-faces f f preferably have insertedwearing-plates f so that they can be replaced or removed when worn andso that the wearing-faces may be of adifferent material, if desired,from the friction-faces of the sliding friction-blocks H H. Inside thelaterally-oblong sliding friction-shell E there are two laterally-oblongsliding friction-blocks H H, having exterior horizontal friction-facesit h in sliding frictional engagement with the corresponding horizontalfriction-faces f of the shell F, and two narrow longitudinallyslidingfrictionblocks H H, having exterior upright friction-faces it h insliding frictional engagement with the corresponding upright interiorfriction-faces f 0f the friction-shell F. Each of the slidingfriction-blocks H H has at each end thereof an inclined or wedging faceIf, contacting with the corresponding inclined or wedging faces g of thetwo oppositely-disposed laterally-oblong wedges GG". Each of the wedgesGr G has four inclined or wedging faces g, one for each of thefrictionblocks H H. The rear laterally-oblong wedge G bears against thefront ends of the two parallel springs E E, and the frontlaterally-oblong wedge G bears against the front follower C,beinginterposed between said follower and the friction-blocks H H.

In buffing the front follower and the wedges Gr Gr and. friction-blocksH H move with the draw-bar, while the rear follower and friction-shell Fare held stationary by the rear stops of the side plates orstop-castings E. In pulling the action is the reverse, the rear followerand friction-shell F moving with the draw-bar and the front follower,wedges, and friction-blocks being held stationary by the front stops onthe side plates or stop-castings.

I claim 1. In a friction draft-rigging the combination with a draw-barand d raw-bar extension or yoke, of side plates or stop-castings, twoparallel longitudinally-arranged springs,alatorally-oblong,longitudinally-sliding frictionshell having two wide and two narrowinterior friction-faces, two laterally-oblong and.

two narrow longitudinally -sliding frictionblocks having exteriorfriction-faces in sliding frictional engagement with the interiorfriction-faces of said shell, and furnished each with an inclined orwedging face at each end thereof, and a pair of oppositely-disposedlaterally-oblong wedges, substantially as speci- Iied.

2. In a friction draft-rigging the eombination with a draw-bar anddra\\'-bar extension or yoke, of side plates or stop-castings, twoparallel, longitudinally-arranged springs, a laterally-oblong,longitudinally-sliding friction-shell having two wide and two narrowinterior friction-faces, two laterally-oblong and two narrowlongitudinally-sliding frictionblocks having exterior friction-faces insliding frictional engagement with the interior friction-faces of saidshell, and furnished each with an inclined or wedging face at each endthereof, and a pair of oppositely-disposed oblong wedges, saidfriction-shell having an external recess or notch to receive one limb ofthe draw-bar extension or yoke, to cause thelaterally-oblongfriction-shell to be maintained centrally of thedraw-bar extension, substantially as specified.

3. In a friction draft-rigging the eonibiinttion with a draw-bar,draw-bar extension, side plates and followers, of a laterally-ol)lon g,longitudinally-sliding friction -shell, longitudinally-slidingfriction-blocksinside the shell, a pair of longitudinally-extendingsprings arranged side by side within said shell, and a. wedge forcausing said friction-blocks to be forcibly pressed and held in slidingfrictional engagement with said shell, substantially as specified.

a. In a friction draft-rigging, the combination with a draw-bar anddraw-bar extension or yoke, of side plates or stop-castings, twoparallel longitudinally-arranged springs, a laterally-oblong,longitudinally-sliding frictionshell havingtwo wide and two narrowinterior friction -faces, two laterally-oblong and two narrowlongitudinally-sliding frictiondiloeks having exterior friction-faces insliding fric tional engagement with the interior frictionfaces of saidshell, and furnished each with an inclined or wedging face at each endthereof, and a pair of oppositely-disposeil, laterallyoblong wedges,said friction-shell having a closed rear end against which one end ofthe springs bear, substantially as specified.

5. In a friction draft-rigging the combination with a draw-bar, draw-barextension, side plates and followers, of a laterally-ol ilonglongitudinally-sliding friction shell having one closed end bearingagainst one of the followin sliding frictional engagement with said ersand againlst WlllCfil 011116 end1 of the two shell, substantially asspecified. springs bear, ongitu ina y-si ing frictionblocks inside theshell, a pair of longitudi- FREDERICK nally-extending springs arrangedside by side Witnesses: Within said shell, and awedge for causing saidH. M. MUNDAY, friction-blocks to be forcibly pressed and held WILLIAM A.GEIGER.

